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R. BAR-NARD & BVMILBS.

TUBE BXPANDBR.

No. 325,150. C! Patented Aug. 25, 1885.

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ROBERT BARNARD AND EDWIN MILES, OF LONDON, ENGLAND.

TUBE-EXPANDER.

SPECEECATLON forming part of Letters Patent No. 325,150, dated August 25,1885.

Application filed October, 1834.

T0 @ZZ whom it may concern,.-

Beitknown that we, Ronnn'r Balmain) and EDWIN MILES, subjects of the Queen of Eugland, residing at London, England, have invented new and useful Improvements in Tube Expanders, of which the following` is aspeeificati-on.

This invention will be best explained by reference'to the accompanying drawings, in which Figure l is a sectional elevation of the tool; Fig. 2, a plan upon line y e of Fig. 1, and Flg. 3 a view of one form of roller for expanding or shouldering the tube on both sides of the tube-plate. Fig. lL is a plan of the ratchet shown in Fig. l.

A is the box or nut, I3 the screw, and C the mandrel, having the circular collar D fixed to it by screws, so that it can be readily removed and changed for the hexagonal collar shown in Fig. 2.

The cap E is secured by screws to the end of the screw B, as shown, the collar D being free to turn in the recess E; but as the screw is moved in or out the mandrel C is carried with it.

The projecting portion ofthe cap E is squared at E2 to receive the wrench or spanner F. The most convenient form of this portion is hexagonal, and we therefore prefer to adopt that shape in this and the other similar cases.

The portion E" of the cap is round for the Spanner to rest on when not in use. The end of the mandrel is also squared hexagonal at O to receive the ratchet-brace. G, by which it is revolved.

The nut A is squared at A' to receive the wrench or Spanner H, the round portion A2 serving for it to hang on when not in use.

K is one of the rollers, having a double taper somewhat as shown.

The action is as follows: The tool being placed in the tube l?, the mandrel (l is drawn .drel.

(No model.)

yond the tube-plate and bell mouthing it, as shown.

It" the form of the roller shown in Fig. 3 be used, the tube will be expanded or have a shoulder formed on both sides of the tubeplate. as will be well understood.

Vhen, on account of the roughness of the tube, the tool sticks and more poweris required to turn it, the wrench H may be used upon the squared portion A. This carries the whole tool round.

Then the `job is finished, the pressure is relaxed and the tool withdrawn.

It will be seen that in the roller K there is a shoulder, K3. The obj ect of this is to setback the portion 'of the tube projecting beyond the tube-plate and form a shoulder, P', somewhat as shown in Fig. l, so as to canse the tube to become a stronger stay than it would be if the end of the tube were merely bent outward.

The portion K of the rollers is shown in Fig. l as having a very slight taper; but it mustbeunderstood that the exact shapeof the rollers may be variedv as required, though it is desirable to make the taper of the portion K'Z correspond to that of the mandrel,'so that a large bearing-surface may be obtained.

Referring to 2,` it will be noticed that the recess E/is squared, (hexagonah) and that the collar D is also hexagonal to fit the recess, while the collar Din Fig. 1 -is round, so as to turn free in the recess. Either collar may be used; but if the hexagonal one be used it forms a practically-rigid connection between the mandrel C and the screw B, sothat operating either the brace G or the wrench F will have the effectof turning both screw and man- This is useful to save time where alarge number of similar tubes have to be expanded, and where a single revolutioinor thereabout,is sufficient to nish one end of a tube.

By unscrewing the nut B the mandrel can be withdrawn from the nut or box A, and the rollers K be changed and the mandrel replaced without the necessity for taking the tool to pieces.

Te claiml. In a tube-expander, the combination of the hollow screw, the hollow cap E, secured on the top thereof, the screw and cap having formed therein the recess E, tbe removable ICO collar in said recess,` the mandrel, and means by which the said collar is secured to the mandrel, as set forth.

2. In atube-expauder, the combination ofthe 5 hollow screw, the hollow cap E, secured on the top thereof, the screw and cap being provided with recess E', the mandrel C, located in and passing through the hollow of said screw and cap, and the collar D, located in said re- :o cess E and encompassing and secured to the i 5 which revolves the mandrel, and is secured on the top thereof, and the wrench F, attached to the cap E and serving to rotate it and the screw, as set forth.

4. In a tube-expander, the combination of 2o the mandrel, the hollow screw surrounding it,

the box or nut A in which the screw rotates, the wrench F, attached to the cap E and serv ing to rotate the screw, the wrench G, attached to and serving to rotate the mandrel, and the wrench H, attached to and serving to rotate the box, as set forth.

5. In a tubeeXpander, the combination of the hollow screw, the mandrel within said screw, the box surrounding the screw, andthe roller having faces K K2 and shoulder K, as set forth.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

ROBERT BARNARD. EDWIN MILES.

Witnesses:

ALFRED J BoULT, BERNHARD DUKics. 

